Greek yogurt finds yet another use in this tasty leftover chicken or turkey salad sandwich made even tastier with the addition of caramelized onions. Tart yogurt and sweet caramelized onions are a combination found in several of the Dodecanese islands, usually tossed together over pasta. It’s an intoxicating mix and yet another example of how varied and delicious is the Mediterranean Diet, even in the form of a sandwich!